h1,h2,h3,h4,h5,h6,ul,div{
    padding:0;
    margin: 0;
}
*{
    margin:0;
    padding:0;
}
.red{
    color:red;
}
.black{
    color:black;
}
.hui{
    border-radius: 5px;
    background: rgba(102, 102, 102, 0.5);
}
.huang{
    border-radius: 5px;
    background: rgb(241, 123, 10);
}
.zindex0{
    z-index: 0;
}
.zindex1{
    z-index: 1;
}
html{
    font-size: 62.5%;
    padding:0;
}
li{
    list-style-type: none;
}
span{
    font-size: 14px;
}
header{
    --site-width:1154px;
    padding:0;
    margin: 0;
    width:100%;
    min-width: max-content;
}

a{
    text-decoration: none;
    color: black;
}
a:hover{
    color:red;
}
.w1200{
    width: 1154px;
    margin: 0 auto;
    
}
.a1{
    height: 137px;
    padding: 0;
    margin: 0;
    border: 0;
}
/* 页面顶部 */

.a1 .b2 img{
    width: 1154px;
}

/* 导航栏 */
nav ul{
    display: flex;
}

.a2 > li > a{
    background:url(https://jumc.jju.edu.cn/images/banner_12.jpg);
    color: aliceblue;
}

nav li{
    flex:1;
}
nav a{
    display: block;
    text-align: center;
    font-weight: bold;
    height: 48px;
    line-height: 40px;
    overflow: hidden;
}
nav li >a{
    font-size: 1.8rem;
}

.a2>li:not( :nth-of-type(2) )>a:hover{
    height: 40px;
    background: #1E5E88 ;
}
/* 二级菜单 */

nav ul.sub_menu{
    display: none;
    position: absolute;
}

.sub_menu a{
    width: 98px;
    height: 28px;
    line-height: 28px;
    text-align: center;
    color:#000;
    background: url(https://jumc.jju.edu.cn/system/resource/images/nav/imgnav_vsb_level2_bg_1.png);
}
.sub_menu a:hover{
    background: #1E5E88 ;
}
nav li:hover ul.sub_menu{
    display:flex;
    flex-direction: column;
    align-items: stretch;
    z-index: 999;
}

/* 1 */
.slider{
    position: relative;
    width:1154px;
    height:247px;
    margin:0 auto;
}
.slider img{
    position: relative;
    width: 1154px;
    height:247px;
}
.tupian{
    position: absolute;
    left: 0;
    top: 0;
    
}

.slider ul:nth-of-type(1) li{
    position: absolute;
}
.lun{
    position: absolute;
    z-index: 2;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 12px;
    bottom: 10px;
    right: 10px;
}
.lun li{
    width: 12px;
    height: 12px;
    display: flex;
    justify-content: center;
    line-height: 12px;
    text-align: center;
    background: #fff;
    margin-left: 5px;
}
.lun li:hover{
    color:red;
}


/* a3  */
.a3 {
    display: flex;
    height: 399px;
    align-items: center;
}
.a3 a:hover{
    color:#f00;
    text-decoration:underline;
}
 
/* a3,1 */


.a3 .b1 {
    display: flex;
    flex-wrap: wrap;
    position: relative;
    width: 546px;
    height: 320px;
    border: 13px solid rgb(81, 255, 243) ;
    border-radius: 13px;
    margin:0px 15px 0px 42px;
    padding:0px 5px;
}

.a3 .b1 img{
    width: 486px;
    height: 285px;
    margin:10px 4px 0px 0px;
}

.a3 .b1 ul li a{
    display: flex;
    justify-content: center;
    align-items: center;
    height: 25px;
    font-size: 14.666666666px;
}
.lun2li{
    position: absolute;
    display: flex;
    z-index: 2;
    right: 10px;
    bottom: 30px;

}
.lun2li li{
    width: 20px;
    height: 20px;
    font-size: 15px;
    display: flex;
    justify-content: center;
    text-align: center;
    margin-left: 5px;
}
.lun2li li:hover{
    background: rgb(102,102,102,0.3);
}
.a3 .b1 ul li a:nth-of-type(2){
    position: absolute;
    z-index: 2;
    width: 22px;
    height: 22px;
    border-radius:6px;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 12px;
    top: 270px;
}

.a3 .b1 li a:last-child{
    font-size:16px;
    height: 25px;
}
.a3 .b1 ul:nth-of-type(1) li{
    position: absolute;
}


/* a3,2 */
.a3 .b2{
    width: 580px;
    margin-right:57px;
}
.a3 .b2 li a{
    font-size: 14px;
}
.a3 .b2 >div:first-child >ul >li:first-child a{
    color:#f00;
}
.a3 .b2 li{
    display: flex;
    justify-content: space-between;
    width: 442px;
    margin:3px 0 6px;
    padding: 0;
}
.a3 .b2 >div{
    height: 50%;
    margin: 25px 21px;
}
.a3 .b2 >div:last-child{
    margin-top:55px;
}
.a3 .b2 span{
    font-size: 14px;
}

/* a4 */

.a4 ul{
    display: flex;
    margin-top: 20px;
    height: 25px;
}
.a4 ul img{
    width: 113px;
    height: 25px;
}
.a4 >img{
    margin-left:17px;
}
.a4 ul> li:first-child{
    margin: 0px 33px;

}
.a4 ul> :not(:first-child){
    margin: 0px auto;
}


/* footer */
footer{
    margin-top: 20px;
}

footer>div:first-child{
    height: 46px;
    background: url("./images/Line.jpg") repeat-x;
    display: flex;
    justify-content: flex-end;
    align-items: center;
}
footer div:first-child span{
    color:aliceblue;
}
footer div:last-child{
    height: 74px;
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
}
footer a:hover{
    text-decoration:underline;
}